January 28, 2003
To: Parents and guardians of students enrolled at Contra Costa Juvenile Hall.
Persons at residences or other properties within 1000 feet of the proposed
emergency standby diesel generator located at 202 Glacier Drive, Martinez.
From: Bay Area Air Quality Management District
Roberta Cooper Re: Emergency Standby Diesel Generator
Scott Haggerty 202 Glacier Drive, Martinez, CA
Permit Application # 6456
CONTRA COSTA COUNTY
Mark DeSaulnier Summary
Gayle Uilkema The Bay Area Air Quality Management District (the "District") is the local agency that
(Secretary) regulates stationary sources of air pollution such as factories, industrial sites, and gasoline
MARIN COUNTY stations.
Harold C. Brown, Jr.
Under State law, the District must notify parents and neighbors before issuing a permit for a
project that will increase emissions of any toxic air contaminant near a school. The purpose
Brad Wagenknecht of this notice is to inform you of one such proposed project. Arntz Builders/Contra Costa
Juvenile Hall has applied for a permit to operate an emergency standby diesel generator at a
SAN FRANCISCO COUNTY site located at 202 Glacier Drive in Martinez. This is near the following school(s): Contra
Chris Daly Costa Juvenile Hall.
(Vacant) The District has prepared a health risk screening report that describes the possible health
effects from the increased toxic air contaminants. Based on this screening, the maximum
SAN MATEO COUNTY cancer risk is no more than 4 chances in a million for the nearest residents. For students who
Jerry Hill attend nearby schools, the maximum risk is no more than 4 chances in a million. These
calculated levels of risk are within acceptable levels established by the District in its Risk
Management Policy. The District plans to issue an Authority to Construct and/or Permit to
Operate for the proposed project.
SANTA CLARA COUNTY
Liz Kniss In order to put the preceding risk estimate into perspective, here are some other risk numbers
Dena Mossar for comparison:
1) The lifetime risk of cancer (excluding skin cancers) in the general population is about
John F. Silva one in three, or 333,000 chances in a million.
SONOMA COUNTY 2) The risk of cancer due to background concentrations of toxic air contaminants
Pamela Torliatt routinely monitored in the Bay Area is about 200 chances in a million.
William C. Norton Health Risk Screening Report is Available
The proposed permit will increase emissions of the following toxic air contaminant(s):
Diesel exhaust particulate matter: 4.1 lb/year
The potential risk values were calculated using a standard risk assessment methodology.
This methodology assumes that residents are exposed to the maximum concentrations of
toxic air contaminants for 24 hours a day continuously for 70 years. It further assumes that
the school is occupied 24 hours per day, 7 days per week, every year. The screening
methods used by the District to estimate risk are based on conservative or “worst case”
assumptions of the operating conditions for this facility. This type of analysis is considered to
be health protective and is not meant to determine the actual risk; rather it is performed under
strict guidelines as a means to compare the source to other regulated sources throughout the
District. The District's Risk Management Policy can be viewed on our website at
The Health Risk Screening Report describes the basis for the risk estimate. You may request
a copy of this report by calling the District Permit Services Division at (415) 749-5008 or by
downloading it from the District website at http://www.baaqmd.gov/permit/pn.htm.
Public Comment Period
There is a thirty-day period for public response to this proposal. The public comment period
for this project will end on February 26th 2003. If you wish to comment on the proposed
project, you may make your comments in writing or by email. Please address them to:
Emergency Standby Diesel Generator Public Notice Response
Attn: Bhagavan Krishnaswamy
939 Ellis Street
San Francisco, CA 94109
Alternatively, you may call (415) 749-5008 and leave a message up to one minute in length.
Please include your name and mailing address, or name and telephone number, so that a
District staff person may respond to your message.